CVE-2026-103008: Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted reques

Routine

MEDIUM 6.5UPGRADE

CVE-2026-103008 is a medium-severity flaw (CVSS 6.5) affecting elasticsearch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with no bound on recursion depth. Elasticsearch contains an uncontrolled recursion weakness in how it builds and serializes geometry values produced by scripted runtime fields. Unlike geometry supplied as text, which is subject to a nesting-depth limit, geome

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-10-06
Last modified	2026-10-09

Publisher (CNA): Elastic · Vendor: elastic

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 20:17 UTCPublished CVE record published
2026-10-09 13:21 UTCUpdated Record last modified

elastic elasticsearch UPGRADE

Affected: >= 8.12.0 and < 8.19.23 · >= 9.0.0 and < 9.4.8 · >= 9.5.0 and < 9.5.5

Fixed in: 8.19.23, 9.4.8, 9.5.5

Safe to downgrade to: a release before 8.12.0

1. Check installed version

apt-cache policy elasticsearch || rpm -q elasticsearch || elasticsearch --version

2. UPGRADE to 8.19.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade elasticsearch

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade elasticsearch

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.12.0 (Debian / Ubuntu)

apt-cache madison elasticsearch sudo apt install elasticsearch=<VERSION_BEFORE_8.12.0> sudo apt-mark hold elasticsearch

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list elasticsearch sudo dnf downgrade elasticsearch-<VERSION_BEFORE_8.12.0> sudo dnf versionlock add elasticsearch

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Elastic Security Announcements: Elasticsearch 8.19.23, 9.4.8, 9.5.5 Security Update (ESA-2026-198) 2026-10-06

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-103008?

elasticsearch: upgrade to 8.19.23, 9.4.8, 9.5.5. Exact commands for each OS are on this page.

Is CVE-2026-103008 being exploited?

CVE-2026-103008 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-103008 affect?

CVE-2026-103008 affects elasticsearch. Severity is medium (CVSS 6.5). Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with no bound on recursion depth. Elasticsearch c

How urgent is CVE-2026-103008?

Priority 29/100. No elevated risk signals yet.

Software pages

Elasticsearch vulnerabilities

Related CVEs

CVE-2026-56148 MEDIUM 6.5 UPGRADE Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to a denial of service via Excessive Allocation (CA
CVE-2026-49090 MEDIUM 6.5 UPGRADE Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to a denial of service via Excessive All
CVE-2026-56149 MEDIUM 4.9 UPGRADE Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of servic
CVE-2026-56145 MEDIUM 6.5 UPGRADE Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Alloc
CVE-2026-63136 MEDIUM 6.5 UPGRADE Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Alloc

References

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